131445309987 has 24 divisors (see below), whose sum is σ = 191936998656. Its totient is φ = 86676646896.

The previous prime is 131445309973. The next prime is 131445309991. The reversal of 131445309987 is 789903544131.

131445309987 is a `hidden beast` number, since 1 + 3 + 1 + 445 + 30 + 99 + 87 = 666.

It is not a de Polignac number, because 131445309987 - 2⁶ = 131445309923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131445309907) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 517578 + ... + 728544.

It is an arithmetic number, because the mean of its divisors is an integer number (7997374944).

Almost surely, 2^131445309987 is an apocalyptic number.

131445309987 is a deficient number, since it is larger than the sum of its proper divisors (60491688669).

131445309987 is a wasteful number, since it uses less digits than its factorization.

131445309987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211727 (or 211724 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 131445309987 in words is "one hundred thirty-one billion, four hundred forty-five million, three hundred nine thousand, nine hundred eighty-seven".